问题
选择题
They want to develop a kind of dog-friendly food _____ will help dog owners cool down their pets. [ ]
A. who
B. what
C. which
D. whether
答案
答案:C
They want to develop a kind of dog-friendly food _____ will help dog owners cool down their pets. [ ]
A. who
B. what
C. which
D. whether
答案:C